Improvement in valves for compound engines



Patented Apri|27,1875.

THE GRAPHIC CO.PHOT0LITH.39&4I PARK PLAGE.N.Y.

W. WRIGHT Valve for Compound Engines.

UNITED STATES IMPROVEMENT IN VALVES FOR COMPOUND ENGlNES.

Specilication forming part of Letters Patent No. 162,5 13, dated April27, 1875;

application tiled March 24, 1875.

To all whom it may concern Be it known that I, WALTER WEIGHT, ot'Tapleyville, (Danvers Centre,) of the county of Essex and State ofMassachusetts, have invented a new and useful Improvement inSteam-Engines; and do hereby declare the same to be fully described inthe following specification and represented in the accompanyingdrawings, of which- Figure l is a longitudinal section, and Fig. 2 atransverse section, of a double-cylinder engine with my invention, whichrelates to the valve for supplying steam to and discharging it from themain cylinder, and into and from the larger or expansive cylinder, suchvalve, as represented, being wedge-shaped in transverse section, and tooperate with seats out of parallelism.

My invention further relates to a peculiar combination of two cylinders,anda duplex faced valve, to operate as hereinafterdescribed. Also, to acombination of a bearing or support rail and adjusting -screws with thewedgeshaped valve and the two cylinders, arranged in manner and tooperate substantially as hereinafter explained.

In the drawings, A denotes the main or lesser cylinder, and B the largeror expansive one, C being the piston of the former, and D that of thelatter. The valve shown at F is arranged between the two cylinders, ortheir valve-seats G H. rlhe faces of both seats are pla-ne surfaces, onebeing out of parallelism with or inclined to the other transversely, asshown in Fig. 2.

In Fig. 2, b represents the steam-induct pipe leading into asteam-chamber, a, arranged at one side of the cylinder A, in manner asindicated in the figures. rlhis chamber opens through the next adjacentseat of the valve, as seen at c c', and between two ports, d d, leadingthrough such seat from the ends of the cylinder A. The cylinder B isalso provided with similar end ports e e', and an intermediate dischargeor waste steam passage, f, all being arrangedvwith it and its valve-seatin manner as represented. The valve F has two passages, gg', leadin gtransversely through it, as shown. In its face, next to the cylinder A,such valve has two open chambers, h 71.', and, furthermore, it has inthe oppositetace three ports. i t" la, connected and arranged asrepresented. The said valve rests and slides on or against a rail orbar, l, supported on adjusting -screws m m, (see Fig. 3,) which is alongitudinal section taken through the valve.

As the bearing-surfaces ot the valve and its seats may become worn fromtime to time, the valve may be forced up to them by setting` up thescrews. If desirable, the valve may be provided with friction-rollers torest and run on the rail-Z.

In the operation of this engine the valve is iirst to be moved, so as tobring thechamber h in communication with the ports c' and d', in whichcase the ports d, g, and e will be in communication. The port c willalso be open into the port c', and the port k will also open into theexhaust-passage f. Steam will then be owing into the cylinder A at oneend, so as t0 move its piston, and force the steam through the ports d,g, and e into the auxiliary or expansive cylinder B. This steam willmove the piston D ot' said cylinder B, and expel the exhaust steamthrough theA ports e', i', and la. On moving the valve, so as to bringthe ports e', g, and'tl into communication, the chamber h will be put incommunication with the ports c and cl, and the port e will open intoport i. Under this state of things the piston C will be forced in theopposite direction, and the waste steam will be driven into the largercylinder D, whereby its piston will be moved the opposite way from whatit was before, and the exhaust steam ot' said cylinder D will beexpelled by the ports e, t', and 7s.

The valve and its seats may have their rubbing-surfaces parallel, and beprovided with ports and chambers arranged as represented, and stillmake, with the other ports, a good engine, provided one cylinder bemovable toward the other, or the two be connected by screwbolts andnuts, arranged as shown in Fig. 2. It being, however, far better to havethe wedgeshaped valve, owing to the greater facility with. which thewearingsurt'aces of it and its seats may be brought in close contact, Iprefer to use such a valve.

I claim- 1. In combination with the two cylinders A B, arrau ged andprovided with inlet and outlet passages and ports a, c c', d d', e, f,and c,

as described, a duplex-seated parallel-faced Wedge-shaped valve F andthe two cylinders valve, F, arranged between such two eylin- A B,arranged and constructed substantially ders, l(rnd provided with tbeopen chambers h as speeitied.

h the transverse passzwes g g and the con- Y neoted ports t' 7c fi', all1jioeng to operate as WALTER W RIGHT' specified. Witnesses:

2. The combination of the bearing or sup- R. H. EDDY,

port rail Z and its adjusting-screws m with the J. R. SNOW.

